Absurdity in Surah 20

"We have revealed it [the Quran] as a Lecture in Arabic."
Then why are there so many non-Arabic words and sources for it?
And why would God prefer one language over another? Is he the tribal god of the Arabs? 20:113

In Genesis (3:22-24), Adam and Eve are driven out of the Garden of
Eden before eating from the "Tree of Life" and thereby becoming immortal. But here they eat from
"the tree of immortality and power" -- yet they don't become immortal or powerful, they become ashamed
of their nakedness. Why? 20:120-1